Association of haemoglobin levels with postoperative cardiovascular adverse events in patients undergoing vascular surgery

摘要

In a recently published, retrospective observational study of vascular surgery patients, Valentijn et al showed that preoperative haemoglobin levels, postoperative haemoglobin levels and haemoglobin decrease were all related to an increased risk of 30-day postoperative cardiovascular adverse events. Strengths of this study include the large sample of patients, and the use of multivariable and sensitivity analyses to adjust, and to reduce, the influence of confounding variables on study endpoints. However, other than the limitations described in the discussion of the article, we have noted further issues of this study making the interpretation of their results questionable.